Performance analysis of spatially distributed MIMO systems
Date
2017-03-09
Authors
Bashar, Farhana
Abhayapala, Thushara
Journal Title
Journal ISSN
Volume Title
Publisher
Institution of Engineering and Technology (IET)
Abstract
With the growing popularity of ad-hoc sensor networks, spatially distributed multiple-input multiple-output
(MIMO) systems have drawn a lot of attention. This work considers a spatially distributed MIMO system with randomly
distributed transmit and receive antennas over spatial regions. The authors use the modal decomposition of wave
propagation to analyse the performance limits of such system, since the sampling of the spatial regions populated with
antennas is a form of mode excitation. Specifically, they decompose signals into orthogonal spatial modes and apply
concepts of MIMO communications to quantify the instantaneous capacity and the outage probability. The authors’
analysis shows that analogous to conventional point-to-point MIMO system, the instantaneous capacity of spatially
distributed MIMO system over Rayleigh fading channel is equivalent to a Gaussian random variable. Afterwards, they
derive an accurate closed-form expression for the outage probability of proposed system utilising the definition of
instantaneous capacity. Besides, in rich scattering environment, the spatially distributed MIMO system provides best
performance when the spatial regions are of same size, and each region is equipped with equal number of antennas.
Furthermore, to facilitate the total transmit power allocation among the channels, they propose an algorithm which
indicates a significant performance improvement over conventional equal transmit power allocation scheme, even at
low signal-to-noise ratio.
Description
Keywords
multiple-input multiple-output (MIMO), systems, sensor, networks, distributed, spatial, random, transmit, modal, decomposition, wave, propagation, antennas
Citation
Collections
Source
IET Communications
Type
Journal article
Book Title
Entity type
Access Statement
Open Access